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src/lib/libcrypto/cms/cms_sd.c

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/* $OpenBSD: cms_sd.c,v 1.33 2024/04/20 10:11:55 tb Exp $ */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 2008 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <stdlib.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/cms.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "asn1_local.h"
#include "cms_local.h"
#include "evp_local.h"
#include "x509_local.h"
/* CMS SignedData Utilities */
static CMS_SignedData *
cms_get0_signed(CMS_ContentInfo *cms)
{
if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_signed) {
CMSerror(CMS_R_CONTENT_TYPE_NOT_SIGNED_DATA);
return NULL;
}
return cms->d.signedData;
}
static CMS_SignedData *
cms_signed_data_init(CMS_ContentInfo *cms)
{
if (cms->d.other == NULL) {
cms->d.signedData = (CMS_SignedData *)ASN1_item_new(&CMS_SignedData_it);
if (!cms->d.signedData) {
CMSerror(ERR_R_MALLOC_FAILURE);
return NULL;
}
cms->d.signedData->version = 1;
cms->d.signedData->encapContentInfo->eContentType =
OBJ_nid2obj(NID_pkcs7_data);
cms->d.signedData->encapContentInfo->partial = 1;
ASN1_OBJECT_free(cms->contentType);
cms->contentType = OBJ_nid2obj(NID_pkcs7_signed);
return cms->d.signedData;
}
return cms_get0_signed(cms);
}
/* Just initialise SignedData e.g. for certs only structure */
int
CMS_SignedData_init(CMS_ContentInfo *cms)
{
if (cms_signed_data_init(cms))
return 1;
else
return 0;
}
LCRYPTO_ALIAS(CMS_SignedData_init);
/* Check structures and fixup version numbers (if necessary) */
static void
cms_sd_set_version(CMS_SignedData *sd)
{
int i;
CMS_CertificateChoices *cch;
CMS_RevocationInfoChoice *rch;
CMS_SignerInfo *si;
for (i = 0; i < sk_CMS_CertificateChoices_num(sd->certificates); i++) {
cch = sk_CMS_CertificateChoices_value(sd->certificates, i);
if (cch->type == CMS_CERTCHOICE_OTHER) {
if (sd->version < 5)
sd->version = 5;
} else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
if (sd->version < 4)
sd->version = 4;
} else if (cch->type == CMS_CERTCHOICE_V1ACERT) {
if (sd->version < 3)
sd->version = 3;
}
}
for (i = 0; i < sk_CMS_RevocationInfoChoice_num(sd->crls); i++) {
rch = sk_CMS_RevocationInfoChoice_value(sd->crls, i);
if (rch->type == CMS_REVCHOICE_OTHER) {
if (sd->version < 5)
sd->version = 5;
}
}
if ((OBJ_obj2nid(sd->encapContentInfo->eContentType) != NID_pkcs7_data)
&& (sd->version < 3))
sd->version = 3;
for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
if (si->sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
if (si->version < 3)
si->version = 3;
if (sd->version < 3)
sd->version = 3;
} else if (si->version < 1)
si->version = 1;
}
if (sd->version < 1)
sd->version = 1;
}
/* Copy an existing messageDigest value */
static int
cms_copy_messageDigest(CMS_ContentInfo *cms, CMS_SignerInfo *si)
{
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *sitmp;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
ASN1_OCTET_STRING *messageDigest;
sitmp = sk_CMS_SignerInfo_value(sinfos, i);
if (sitmp == si)
continue;
if (CMS_signed_get_attr_count(sitmp) < 0)
continue;
if (OBJ_cmp(si->digestAlgorithm->algorithm,
sitmp->digestAlgorithm->algorithm))
continue;
messageDigest = CMS_signed_get0_data_by_OBJ(sitmp,
OBJ_nid2obj(NID_pkcs9_messageDigest), -3, V_ASN1_OCTET_STRING);
if (!messageDigest) {
CMSerror(CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
return 0;
}
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
V_ASN1_OCTET_STRING, messageDigest, -1))
return 1;
else
return 0;
}
CMSerror(CMS_R_NO_MATCHING_DIGEST);
return 0;
}
int
cms_set1_SignerIdentifier(CMS_SignerIdentifier *sid, X509 *cert, int type)
{
switch (type) {
case CMS_SIGNERINFO_ISSUER_SERIAL:
if (!cms_set1_ias(&sid->d.issuerAndSerialNumber, cert))
return 0;
break;
case CMS_SIGNERINFO_KEYIDENTIFIER:
if (!cms_set1_keyid(&sid->d.subjectKeyIdentifier, cert))
return 0;
break;
default:
CMSerror(CMS_R_UNKNOWN_ID);
return 0;
}
sid->type = type;
return 1;
}
int
cms_SignerIdentifier_get0_signer_id(CMS_SignerIdentifier *sid,
ASN1_OCTET_STRING **keyid, X509_NAME **issuer, ASN1_INTEGER **sno)
{
if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL) {
if (issuer)
*issuer = sid->d.issuerAndSerialNumber->issuer;
if (sno)
*sno = sid->d.issuerAndSerialNumber->serialNumber;
} else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER) {
if (keyid)
*keyid = sid->d.subjectKeyIdentifier;
} else
return 0;
return 1;
}
int
cms_SignerIdentifier_cert_cmp(CMS_SignerIdentifier *sid, X509 *cert)
{
if (sid->type == CMS_SIGNERINFO_ISSUER_SERIAL)
return cms_ias_cert_cmp(sid->d.issuerAndSerialNumber, cert);
else if (sid->type == CMS_SIGNERINFO_KEYIDENTIFIER)
return cms_keyid_cert_cmp(sid->d.subjectKeyIdentifier, cert);
else
return -1;
}
static int
cms_sd_asn1_ctrl(CMS_SignerInfo *si, int cmd)
{
EVP_PKEY *pkey = si->pkey;
int ret;
if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
return 1;
ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_SIGN, cmd, si);
if (ret == -2) {
CMSerror(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
return 0;
}
if (ret <= 0) {
CMSerror(CMS_R_CTRL_FAILURE);
return 0;
}
return 1;
}
static const EVP_MD *
cms_SignerInfo_default_digest_md(const CMS_SignerInfo *si)
{
int rv, nid;
if (si->pkey == NULL) {
CMSerror(CMS_R_NO_PUBLIC_KEY);
return NULL;
}
/* On failure or unsupported operation, give up. */
if ((rv = EVP_PKEY_get_default_digest_nid(si->pkey, &nid)) <= 0)
return NULL;
if (rv > 2)
return NULL;
/*
* XXX - we need to identify EdDSA in a better way. Figure out where
* and how. This mimics EdDSA checks in openssl/ca.c and openssl/req.c.
*/
/* The digest md is required to be EVP_sha512() (EdDSA). */
if (rv == 2 && nid == NID_undef)
return EVP_sha512();
/* Use mandatory or default digest. */
return EVP_get_digestbynid(nid);
}
static const EVP_MD *
cms_SignerInfo_signature_md(const CMS_SignerInfo *si)
{
int rv, nid;
if (si->pkey == NULL) {
CMSerror(CMS_R_NO_PUBLIC_KEY);
return NULL;
}
/* Fall back to digestAlgorithm unless pkey has a mandatory digest. */
if ((rv = EVP_PKEY_get_default_digest_nid(si->pkey, &nid)) <= 1)
return EVP_get_digestbyobj(si->digestAlgorithm->algorithm);
if (rv > 2)
return NULL;
/*
* XXX - we need to identify EdDSA in a better way. Figure out where
* and how. This mimics EdDSA checks in openssl/ca.c and openssl/req.c.
*/
/* The signature md is required to be EVP_md_null() (EdDSA). */
if (nid == NID_undef)
return EVP_md_null();
/* Use mandatory digest. */
return EVP_get_digestbynid(nid);
}
CMS_SignerInfo *
CMS_add1_signer(CMS_ContentInfo *cms, X509 *signer, EVP_PKEY *pk,
const EVP_MD *md, unsigned int flags)
{
CMS_SignedData *sd;
CMS_SignerInfo *si = NULL;
X509_ALGOR *alg = NULL;
int i, type;
if (!X509_check_private_key(signer, pk)) {
CMSerror(CMS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
return NULL;
}
sd = cms_signed_data_init(cms);
if (!sd)
goto err;
si = (CMS_SignerInfo *)ASN1_item_new(&CMS_SignerInfo_it);
if (!si)
goto merr;
/* Call for side-effect of computing hash and caching extensions */
X509_check_purpose(signer, -1, -1);
X509_up_ref(signer);
EVP_PKEY_up_ref(pk);
si->pkey = pk;
si->signer = signer;
si->mctx = EVP_MD_CTX_new();
si->pctx = NULL;
if (si->mctx == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (flags & CMS_USE_KEYID) {
si->version = 3;
if (sd->version < 3)
sd->version = 3;
type = CMS_SIGNERINFO_KEYIDENTIFIER;
} else {
type = CMS_SIGNERINFO_ISSUER_SERIAL;
si->version = 1;
}
if (!cms_set1_SignerIdentifier(si->sid, signer, type))
goto err;
if (md == NULL)
md = cms_SignerInfo_default_digest_md(si);
if (md == NULL) {
CMSerror(CMS_R_NO_DEFAULT_DIGEST);
goto err;
}
if (!X509_ALGOR_set_evp_md(si->digestAlgorithm, md))
goto err;
/* See if digest is present in digestAlgorithms */
for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
const X509_ALGOR *x509_alg;
const ASN1_OBJECT *aoid;
x509_alg = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
X509_ALGOR_get0(&aoid, NULL, NULL, x509_alg);
if (OBJ_obj2nid(aoid) == EVP_MD_type(md))
break;
}
if (i == sk_X509_ALGOR_num(sd->digestAlgorithms)) {
if ((alg = X509_ALGOR_new()) == NULL)
goto merr;
if (!X509_ALGOR_set_evp_md(alg, md))
goto merr;
if (!sk_X509_ALGOR_push(sd->digestAlgorithms, alg)) {
goto merr;
}
alg = NULL;
}
if (!(flags & CMS_KEY_PARAM) && !cms_sd_asn1_ctrl(si, 0))
goto err;
if (!(flags & CMS_NOATTR)) {
/*
* Initialize signed attributes structure so other attributes
* such as signing time etc are added later even if we add none here.
*/
if (!si->signedAttrs) {
si->signedAttrs = sk_X509_ATTRIBUTE_new_null();
if (!si->signedAttrs)
goto merr;
}
if (!(flags & CMS_NOSMIMECAP)) {
STACK_OF(X509_ALGOR) *smcap = NULL;
i = CMS_add_standard_smimecap(&smcap);
if (i)
i = CMS_add_smimecap(si, smcap);
sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
if (!i)
goto merr;
}
if (flags & CMS_REUSE_DIGEST) {
if (!cms_copy_messageDigest(cms, si))
goto err;
if (!(flags & (CMS_PARTIAL | CMS_KEY_PARAM)) &&
!CMS_SignerInfo_sign(si))
goto err;
}
}
if (!(flags & CMS_NOCERTS)) {
/* NB ignore -1 return for duplicate cert */
if (!CMS_add1_cert(cms, signer))
goto merr;
}
if (flags & CMS_KEY_PARAM) {
if (flags & CMS_NOATTR) {
si->pctx = EVP_PKEY_CTX_new(si->pkey, NULL);
if (si->pctx == NULL)
goto err;
if (EVP_PKEY_sign_init(si->pctx) <= 0)
goto err;
if (EVP_PKEY_CTX_set_signature_md(si->pctx, md) <= 0)
goto err;
} else if (EVP_DigestSignInit(si->mctx, &si->pctx, md,
NULL, pk) <= 0)
goto err;
}
if (!sd->signerInfos)
sd->signerInfos = sk_CMS_SignerInfo_new_null();
if (!sd->signerInfos || !sk_CMS_SignerInfo_push(sd->signerInfos, si))
goto merr;
return si;
merr:
CMSerror(ERR_R_MALLOC_FAILURE);
err:
ASN1_item_free((ASN1_VALUE *)si, &CMS_SignerInfo_it);
X509_ALGOR_free(alg);
return NULL;
}
LCRYPTO_ALIAS(CMS_add1_signer);
static int
cms_add1_signingTime(CMS_SignerInfo *si, ASN1_TIME *t)
{
ASN1_TIME *tt;
int r = 0;
if (t)
tt = t;
else
tt = X509_gmtime_adj(NULL, 0);
if (!tt)
goto merr;
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_signingTime,
tt->type, tt, -1) <= 0)
goto merr;
r = 1;
merr:
if (!t)
ASN1_TIME_free(tt);
if (!r)
CMSerror(ERR_R_MALLOC_FAILURE);
return r;
}
EVP_PKEY_CTX *
CMS_SignerInfo_get0_pkey_ctx(CMS_SignerInfo *si)
{
return si->pctx;
}
LCRYPTO_ALIAS(CMS_SignerInfo_get0_pkey_ctx);
EVP_MD_CTX *
CMS_SignerInfo_get0_md_ctx(CMS_SignerInfo *si)
{
return si->mctx;
}
LCRYPTO_ALIAS(CMS_SignerInfo_get0_md_ctx);
STACK_OF(CMS_SignerInfo) *
CMS_get0_SignerInfos(CMS_ContentInfo *cms)
{
CMS_SignedData *sd;
sd = cms_get0_signed(cms);
if (!sd)
return NULL;
return sd->signerInfos;
}
LCRYPTO_ALIAS(CMS_get0_SignerInfos);
STACK_OF(X509) *
CMS_get0_signers(CMS_ContentInfo *cms)
{
STACK_OF(X509) *signers = NULL;
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *si;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (si->signer) {
if (!signers) {
signers = sk_X509_new_null();
if (!signers)
return NULL;
}
if (!sk_X509_push(signers, si->signer)) {
sk_X509_free(signers);
return NULL;
}
}
}
return signers;
}
LCRYPTO_ALIAS(CMS_get0_signers);
void
CMS_SignerInfo_set1_signer_cert(CMS_SignerInfo *si, X509 *signer)
{
if (signer) {
X509_up_ref(signer);
EVP_PKEY_free(si->pkey);
si->pkey = X509_get_pubkey(signer);
}
X509_free(si->signer);
si->signer = signer;
}
LCRYPTO_ALIAS(CMS_SignerInfo_set1_signer_cert);
int
CMS_SignerInfo_get0_signer_id(CMS_SignerInfo *si, ASN1_OCTET_STRING **keyid,
X509_NAME **issuer, ASN1_INTEGER **sno)
{
return cms_SignerIdentifier_get0_signer_id(si->sid, keyid, issuer, sno);
}
LCRYPTO_ALIAS(CMS_SignerInfo_get0_signer_id);
int
CMS_SignerInfo_cert_cmp(CMS_SignerInfo *si, X509 *cert)
{
return cms_SignerIdentifier_cert_cmp(si->sid, cert);
}
LCRYPTO_ALIAS(CMS_SignerInfo_cert_cmp);
int
CMS_set1_signers_certs(CMS_ContentInfo *cms, STACK_OF(X509) *scerts,
unsigned int flags)
{
CMS_SignedData *sd;
CMS_SignerInfo *si;
CMS_CertificateChoices *cch;
STACK_OF(CMS_CertificateChoices) *certs;
X509 *x;
int i, j;
int ret = 0;
sd = cms_get0_signed(cms);
if (!sd)
return -1;
certs = sd->certificates;
for (i = 0; i < sk_CMS_SignerInfo_num(sd->signerInfos); i++) {
si = sk_CMS_SignerInfo_value(sd->signerInfos, i);
if (si->signer)
continue;
for (j = 0; j < sk_X509_num(scerts); j++) {
x = sk_X509_value(scerts, j);
if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
CMS_SignerInfo_set1_signer_cert(si, x);
ret++;
break;
}
}
if (si->signer || (flags & CMS_NOINTERN))
continue;
for (j = 0; j < sk_CMS_CertificateChoices_num(certs); j++) {
cch = sk_CMS_CertificateChoices_value(certs, j);
if (cch->type != 0)
continue;
x = cch->d.certificate;
if (CMS_SignerInfo_cert_cmp(si, x) == 0) {
CMS_SignerInfo_set1_signer_cert(si, x);
ret++;
break;
}
}
}
return ret;
}
LCRYPTO_ALIAS(CMS_set1_signers_certs);
void
CMS_SignerInfo_get0_algs(CMS_SignerInfo *si, EVP_PKEY **pk, X509 **signer,
X509_ALGOR **pdig, X509_ALGOR **psig)
{
if (pk)
*pk = si->pkey;
if (signer)
*signer = si->signer;
if (pdig)
*pdig = si->digestAlgorithm;
if (psig)
*psig = si->signatureAlgorithm;
}
LCRYPTO_ALIAS(CMS_SignerInfo_get0_algs);
ASN1_OCTET_STRING *
CMS_SignerInfo_get0_signature(CMS_SignerInfo *si)
{
return si->signature;
}
LCRYPTO_ALIAS(CMS_SignerInfo_get0_signature);
static int
cms_SignerInfo_content_sign(CMS_ContentInfo *cms, CMS_SignerInfo *si, BIO *chain)
{
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
int r = 0;
EVP_PKEY_CTX *pctx = NULL;
if (mctx == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
return 0;
}
if (!si->pkey) {
CMSerror(CMS_R_NO_PRIVATE_KEY);
goto err;
}
if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
goto err;
/* Set SignerInfo algorithm details if we used custom parameter */
if (si->pctx && !cms_sd_asn1_ctrl(si, 0))
goto err;
/*
* If any signed attributes calculate and add messageDigest attribute
*/
if (CMS_signed_get_attr_count(si) >= 0) {
ASN1_OBJECT *ctype =
cms->d.signedData->encapContentInfo->eContentType;
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
goto err;
if (!CMS_signed_add1_attr_by_NID(si, NID_pkcs9_messageDigest,
V_ASN1_OCTET_STRING, md, mdlen))
goto err;
/* Copy content type across */
if (CMS_signed_add1_attr_by_NID(si, NID_pkcs9_contentType,
V_ASN1_OBJECT, ctype, -1) <= 0)
goto err;
if (!CMS_SignerInfo_sign(si))
goto err;
} else if (si->pctx) {
unsigned char *sig;
size_t siglen;
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
pctx = si->pctx;
if (!EVP_DigestFinal_ex(mctx, md, &mdlen))
goto err;
siglen = EVP_PKEY_size(si->pkey);
sig = malloc(siglen);
if (sig == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_PKEY_sign(pctx, sig, &siglen, md, mdlen) <= 0) {
free(sig);
goto err;
}
ASN1_STRING_set0(si->signature, sig, siglen);
} else {
unsigned char *sig;
unsigned int siglen;
sig = malloc(EVP_PKEY_size(si->pkey));
if (sig == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_SignFinal(mctx, sig, &siglen, si->pkey)) {
CMSerror(CMS_R_SIGNFINAL_ERROR);
free(sig);
goto err;
}
ASN1_STRING_set0(si->signature, sig, siglen);
}
r = 1;
err:
EVP_MD_CTX_free(mctx);
EVP_PKEY_CTX_free(pctx);
return r;
}
int
cms_SignedData_final(CMS_ContentInfo *cms, BIO *chain)
{
STACK_OF(CMS_SignerInfo) *sinfos;
CMS_SignerInfo *si;
int i;
sinfos = CMS_get0_SignerInfos(cms);
for (i = 0; i < sk_CMS_SignerInfo_num(sinfos); i++) {
si = sk_CMS_SignerInfo_value(sinfos, i);
if (!cms_SignerInfo_content_sign(cms, si, chain))
return 0;
}
cms->d.signedData->encapContentInfo->partial = 0;
return 1;
}
int
CMS_SignerInfo_sign(CMS_SignerInfo *si)
{
const EVP_MD *md;
unsigned char *buf = NULL, *sig = NULL;
int buf_len = 0;
size_t sig_len = 0;
int ret = 0;
if ((md = cms_SignerInfo_signature_md(si)) == NULL)
goto err;
if (CMS_signed_get_attr_by_NID(si, NID_pkcs9_signingTime, -1) < 0) {
if (!cms_add1_signingTime(si, NULL))
goto err;
}
if (si->pctx == NULL) {
(void)EVP_MD_CTX_reset(si->mctx);
if (!EVP_DigestSignInit(si->mctx, &si->pctx, md, NULL, si->pkey))
goto err;
}
if (EVP_PKEY_CTX_ctrl(si->pctx, -1, EVP_PKEY_OP_SIGN,
EVP_PKEY_CTRL_CMS_SIGN, 0, si) <= 0) {
CMSerror(CMS_R_CTRL_ERROR);
goto err;
}
if ((buf_len = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &buf,
&CMS_Attributes_Sign_it)) <= 0) {
buf_len = 0;
goto err;
}
if (!EVP_DigestSign(si->mctx, NULL, &sig_len, buf, buf_len))
goto err;
if ((sig = calloc(1, sig_len)) == NULL)
goto err;
if (!EVP_DigestSign(si->mctx, sig, &sig_len, buf, buf_len))
goto err;
if (EVP_PKEY_CTX_ctrl(si->pctx, -1, EVP_PKEY_OP_SIGN,
EVP_PKEY_CTRL_CMS_SIGN, 1, si) <= 0) {
CMSerror(CMS_R_CTRL_ERROR);
goto err;
}
ASN1_STRING_set0(si->signature, sig, sig_len);
sig = NULL;
ret = 1;
err:
(void)EVP_MD_CTX_reset(si->mctx);
freezero(buf, buf_len);
freezero(sig, sig_len);
return ret;
}
LCRYPTO_ALIAS(CMS_SignerInfo_sign);
int
CMS_SignerInfo_verify(CMS_SignerInfo *si)
{
const EVP_MD *md;
unsigned char *buf = NULL;
int buf_len = 0;
int ret = -1;
if ((md = cms_SignerInfo_signature_md(si)) == NULL)
goto err;
if (si->mctx == NULL)
si->mctx = EVP_MD_CTX_new();
if (si->mctx == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
if (EVP_DigestVerifyInit(si->mctx, &si->pctx, md, NULL, si->pkey) <= 0)
goto err;
if (!cms_sd_asn1_ctrl(si, 1))
goto err;
if ((buf_len = ASN1_item_i2d((ASN1_VALUE *)si->signedAttrs, &buf,
&CMS_Attributes_Verify_it)) <= 0) {
buf_len = 0;
goto err;
}
ret = EVP_DigestVerify(si->mctx, si->signature->data, si->signature->length,
buf, buf_len);
if (ret <= 0) {
CMSerror(CMS_R_VERIFICATION_FAILURE);
goto err;
}
err:
(void)EVP_MD_CTX_reset(si->mctx);
freezero(buf, buf_len);
return ret;
}
LCRYPTO_ALIAS(CMS_SignerInfo_verify);
/* Create a chain of digest BIOs from a CMS ContentInfo */
BIO *
cms_SignedData_init_bio(CMS_ContentInfo *cms)
{
int i;
CMS_SignedData *sd;
BIO *chain = NULL;
sd = cms_get0_signed(cms);
if (!sd)
return NULL;
if (cms->d.signedData->encapContentInfo->partial)
cms_sd_set_version(sd);
for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++) {
X509_ALGOR *digestAlgorithm;
BIO *mdbio;
digestAlgorithm = sk_X509_ALGOR_value(sd->digestAlgorithms, i);
mdbio = cms_DigestAlgorithm_init_bio(digestAlgorithm);
if (!mdbio)
goto err;
if (chain)
BIO_push(chain, mdbio);
else
chain = mdbio;
}
return chain;
err:
BIO_free_all(chain);
return NULL;
}
int
CMS_SignerInfo_verify_content(CMS_SignerInfo *si, BIO *chain)
{
ASN1_OCTET_STRING *os = NULL;
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
EVP_PKEY_CTX *pkctx = NULL;
int r = -1;
unsigned char mval[EVP_MAX_MD_SIZE];
unsigned int mlen;
if (mctx == NULL) {
CMSerror(ERR_R_MALLOC_FAILURE);
goto err;
}
/* If we have any signed attributes look for messageDigest value */
if (CMS_signed_get_attr_count(si) >= 0) {
os = CMS_signed_get0_data_by_OBJ(si,
OBJ_nid2obj(NID_pkcs9_messageDigest), -3,
V_ASN1_OCTET_STRING);
if (!os) {
CMSerror(CMS_R_ERROR_READING_MESSAGEDIGEST_ATTRIBUTE);
goto err;
}
}
if (!cms_DigestAlgorithm_find_ctx(mctx, chain, si->digestAlgorithm))
goto err;
if (EVP_DigestFinal_ex(mctx, mval, &mlen) <= 0) {
CMSerror(CMS_R_UNABLE_TO_FINALIZE_CONTEXT);
goto err;
}
/* If messageDigest found compare it */
if (os) {
if (mlen != (unsigned int)os->length) {
CMSerror(CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH);
goto err;
}
if (memcmp(mval, os->data, mlen)) {
CMSerror(CMS_R_VERIFICATION_FAILURE);
r = 0;
} else
r = 1;
} else {
const EVP_MD *md = EVP_MD_CTX_md(mctx);
pkctx = EVP_PKEY_CTX_new(si->pkey, NULL);
if (pkctx == NULL)
goto err;
if (EVP_PKEY_verify_init(pkctx) <= 0)
goto err;
if (EVP_PKEY_CTX_set_signature_md(pkctx, md) <= 0)
goto err;
si->pctx = pkctx;
if (!cms_sd_asn1_ctrl(si, 1))
goto err;
r = EVP_PKEY_verify(pkctx, si->signature->data,
si->signature->length, mval, mlen);
if (r <= 0) {
CMSerror(CMS_R_VERIFICATION_FAILURE);
r = 0;
}
}
err:
EVP_PKEY_CTX_free(pkctx);
EVP_MD_CTX_free(mctx);
return r;
}
LCRYPTO_ALIAS(CMS_SignerInfo_verify_content);
int
CMS_add_smimecap(CMS_SignerInfo *si, STACK_OF(X509_ALGOR) *algs)
{
unsigned char *smder = NULL;
int smderlen, r;
smderlen = i2d_X509_ALGORS(algs, &smder);
if (smderlen <= 0)
return 0;
r = CMS_signed_add1_attr_by_NID(si, NID_SMIMECapabilities,
V_ASN1_SEQUENCE, smder, smderlen);
free(smder);
return r;
}
LCRYPTO_ALIAS(CMS_add_smimecap);
/*
* Add AlgorithmIdentifier OID of type |nid| to the SMIMECapability attribute
* set |*out_algs| (see RFC 3851, section 2.5.2). If keysize > 0, the OID has
* an integer parameter of value |keysize|, otherwise parameters are omitted.
*/
int
CMS_add_simple_smimecap(STACK_OF(X509_ALGOR) **out_algs, int nid, int keysize)
{
STACK_OF(X509_ALGOR) *algs;
X509_ALGOR *alg = NULL;
ASN1_INTEGER *parameter = NULL;
int parameter_type = V_ASN1_UNDEF;
int ret = 0;
if ((algs = *out_algs) == NULL)
algs = sk_X509_ALGOR_new_null();
if (algs == NULL)
goto err;
if (keysize > 0) {
if ((parameter = ASN1_INTEGER_new()) == NULL)
goto err;
if (!ASN1_INTEGER_set(parameter, keysize))
goto err;
parameter_type = V_ASN1_INTEGER;
}
if ((alg = X509_ALGOR_new()) == NULL)
goto err;
if (!X509_ALGOR_set0_by_nid(alg, nid, parameter_type, parameter))
goto err;
parameter = NULL;
if (sk_X509_ALGOR_push(algs, alg) <= 0)
goto err;
alg = NULL;
*out_algs = algs;
algs = NULL;
ret = 1;
err:
if (algs != *out_algs)
sk_X509_ALGOR_pop_free(algs, X509_ALGOR_free);
X509_ALGOR_free(alg);
ASN1_INTEGER_free(parameter);
return ret;
}
LCRYPTO_ALIAS(CMS_add_simple_smimecap);
/* Check to see if a cipher exists and if so add S/MIME capabilities */
static int
cms_add_cipher_smcap(STACK_OF(X509_ALGOR) **sk, int nid, int arg)
{
if (EVP_get_cipherbynid(nid))
return CMS_add_simple_smimecap(sk, nid, arg);
return 1;
}
int
CMS_add_standard_smimecap(STACK_OF(X509_ALGOR) **smcap)
{
if (!cms_add_cipher_smcap(smcap, NID_aes_256_cbc, -1) ||
!cms_add_cipher_smcap(smcap, NID_aes_192_cbc, -1) ||
!cms_add_cipher_smcap(smcap, NID_aes_128_cbc, -1) ||
!cms_add_cipher_smcap(smcap, NID_des_ede3_cbc, -1) ||
!cms_add_cipher_smcap(smcap, NID_rc2_cbc, 128) ||
!cms_add_cipher_smcap(smcap, NID_rc2_cbc, 64) ||
!cms_add_cipher_smcap(smcap, NID_des_cbc, -1) ||
!cms_add_cipher_smcap(smcap, NID_rc2_cbc, 40))
return 0;
return 1;
}
LCRYPTO_ALIAS(CMS_add_standard_smimecap);
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